Start at the iliac crest (the top of your hipbone that you can feel like a shelf on the side of your body). From this level on your spine, measure to the C7 vertebrae, the knobby bone at the base of your neck when you put your head down. Make sure to keep your back straight while having the measurement taken.

Frequently purchased together

Description

Watch him tear down the trail.

Let him carry his own hiking essentials in the Osprey Kids' Jet 18 Backpack. Featuring the same AirScape suspension as Osprey's adult packs, the Jet provides a well-padded, breathable, and highly supportive carry. The edgeless shoulder straps and waist belt reduce chafing on the really long trails. This traditional top loader also features an external sleeve for a hydration reservoir, dual side pockets for water bottles, zippered pockets at front and the lid, and a large stash pocket for layers.